In S1E2, Miss Patty is teaching a dance class and little girls are walking in a circle with books on their heads. Miss Patty says, “Now, walk smooth. That’s a new Harry Potter on your heads. If they should drop, Harry will die and there won’t be any more books.”
The Harry Potter series consists of 7 novels written by J. K. Rowling. The first novel was released in the U.S. in 1998. The 4th book, Harry Potter and the Goblet of Fire, would have been recently published at the time Gilmore Girls’ first season was airing, in 2000. The next Harry Potter book was not released until 2003 (some poor dance student of Miss Patty’s probably spent those 3 long years thinking it was her fault there were no more books).